irq: versatile: rename Kconfig macro in printk

Commit 2389d50 ("ARM: plat-versatile:
move FPGA irq driver to drivers/irqchip") changed Kconfig symbol
PLAT_VERSATILE_FPGA_IRQ_NR to VERSATILE_FPGA_IRQ_NR. It forgot to change
one reference to the related macro in a printk.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/irqchip/irq-versatile-fpga.c

@@ -139,7 +139,7 @@ void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start,
 	int i;
 
 	if (fpga_irq_id >= ARRAY_SIZE(fpga_irq_devices)) {
-		pr_err("%s: too few FPGA IRQ controllers, increase CONFIG_PLAT_VERSATILE_FPGA_IRQ_NR\n", __func__);
+		pr_err("%s: too few FPGA IRQ controllers, increase CONFIG_VERSATILE_FPGA_IRQ_NR\n", __func__);
 		return;
 	}
 	f = &fpga_irq_devices[fpga_irq_id];